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Fundamentals: Roof angle and latitude

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    • CommentAuthorJohn Walsh
    • CommentTimeMar 25th 2017
     
    gg, if you haven't already seen this, you might be interested in the Peveril Solar House ...

    http://www.activehouse.info/cases/peveril-solar-house/

    ... claimed to be "the first house in the UK to be entirely solar heated all year round". Basically, he has a GSHP extracting heat from 48m deep boreholes. Purpose built 'sunboxes' dump solar thermal energy into the borehole, etc., etc. An excellent example of solar tech in action.
    • CommentAuthorgyrogear
    • CommentTimeMar 25th 2017
     
    "There is no precedent for a solar thermal charging system on a single house".

    Great stuff, JW, keep it coming :bigsmile:

    gg
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      CommentAuthorfostertom
    • CommentTimeMar 25th 2017
     
    VH, I'm still not sure why/what you mean by different optimal pitch for PV vs wet.
  4.  
    Hi Tom, if I had a Solar Farm I'd be trying to optimize the amount of kWh's of electricity sold per annum so I'd install the PV panels at about 33°.

    If you're heating a Passive House with a Solar Roof, install a large area of Solar Thermal at a 65°angle to optimize yield over the heating season and you won't need a heat pump. I built Ireland's most energy efficient house in 2010 using this method http://viking-house.co.uk/solar-enhanced-passive-house.html for the last 6 years its average electrical bill was €130/annum or 750kWh/annum. It uses 4kWh/m2.annum for heating, hot water and electricity so beats the Passive House Premium standard introduced 2 years ago hands down. Here's the Solar Heating Dartboard that shows the optimal angle for Solar Heating, sorry its in German.
      Orientation and Angle.jpg
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      CommentAuthorfostertom
    • CommentTimeMar 25th 2017
     
    OK, got it - it's nothing to do with PV vs wet, but whether you want to maximise the take over the whole year, or to maximise deep-winter collection. That makes perfect sense.
    • CommentAuthorJohn Walsh
    • CommentTimeMar 26th 2017
     
    "You can't beat a bit of Bully" - for anyone wondering about the PH Solar Heating Dartboard, whole year heating and "you won't need a heat pump", while the German version works fine in, say, Munich (minimum noon sun altitude 19 deg in late December) from memory, the English version involves Jim Bowen handing out bags of coal for that pesky period when the sun goes AWOL - "That's the Bullseye!"
    • CommentAuthorEd Davies
    • CommentTimeMar 26th 2017
     
    Munich gets 8 to 18% more sunshine (on a 60° elevation panel facing south) than Manchester in each of November, December, January and February according to PVGIS.

    Points just outside the cities to get clear horizons. Munich: N48 14 17 E11 49 46, Manchester: 53°25'13" North, 2°12'49" West.
  8.  
    Posted By: Ed DaviesMunich gets 8 to 18% more sunshine (on a 60° elevation panel facing south) than Manchester in each of November, December, January and February according to PVGIS.
    But the winter temperature is warmer in Manchester than Munich so it about equals itself. Dublin is one of the best cities in Europe for Solar Heating.
    • CommentAuthorEd Davies
    • CommentTimeMar 26th 2017 edited
     
    Yes, less heating needed and, for solar thermal, better efficiency through lower losses. Perhaps I should have written “Munich gets only 8 to 18% more…”.
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      CommentAuthorfostertom
    • CommentTimeMar 26th 2017
     
    Ah but isn't the warmness of Manchester/Dublin taken advantage of in the PH calcs, so requiring less insulation than Munich? All PHs everywhere require same supplementary heating.
  11.  
    You're correct Tom!
    • CommentAuthorEd Davies
    • CommentTimeMar 26th 2017
     
    Who said anything about Passivhaus? It's not the only way of designing or building. And some PH's require a lot less supplementary heating than others.
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      CommentAuthordjh
    • CommentTimeMar 27th 2017
     
    Posted By: Ed Daviessome PH's require a lot less supplementary heating than others.

    Only if they've been overdesigned. Tom's point is that the passivhaus specification requires just enough insulation to make the specific heat demand 15 kWh/m²/year wherever you are in the world (or 10 W/m² max heat load). If you use more insulation than that you are overspecifying (i.e. wasting money, in a rather narrow sense).

    But I agree that the discussion isn't specificaly about passive houses.
    • CommentAuthorgyrogear
    • CommentTimeMar 27th 2017 edited
     
    Rotating Cat House here...

    https://www.youtube.com/watch?v=w0cvUOjGCLM

    there is one about 8 km from here, I ought to go and ask to visit I suppose...

    gg

    Disclaimer : Neither I nor anybody I know had anything to do with the musik... :shamed:
    •  
      CommentAuthordjh
    • CommentTimeMar 27th 2017
     
    Err, very impressive but what am I supposed to learn? And what is the relevance to the thread? We don't know the latitude and it doesn't have a well-defined roof angle.
    • CommentAuthorgyrogear
    • CommentTimeMar 27th 2017 edited
     
    Points taken.

    (The latitude is 48°N and I was about to propose that one could extrapolate the roof angle as being the hypotenuse of a right triangle ? thus (? "give or take carpenter error" = 48°...):shamed:

    however, per discussion sites, it appears not to be a true hemisphere...).
    Just for interest's sake, they only rotate through 33°, and most owners only ever go through 180°, apparently...

    Ho-hum, back to parallelipipedism...
    :sad:

    gg

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